Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19c85f3e325ccc…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 20:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a304992ec06288d5b4a323d54afa7c5 SHA-1: c4bab2c947b034df01c0070800df6b53cce66cd9 SHA-256: 7b19c85f3e325ccc877474724549cf4482315284d53986886d8879326fc253ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/award?keyword=technical+interview+questions+and+answers+for+cse+freshers+pdf PDF link annotation
    • http://rimujitibux.mypressonline.com/28193655630.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/85507102069.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/biblia_de_jerusalen_con_paralelos.pdfIn PDF document text
    • http://sobebal.22web.org/11540653914.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/kufitomu.pdfIn PDF document text
    • http://defiboxifef.22web.org/b._sc_agriculture_syllabus.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/el_politico_baltasar_gracian.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/lujon.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/appareil_electrique_industriel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xozeb/broken_screen_hd_wallpaper.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/spider_man_2020_script.pdfIn PDF document text
    • http://pimekawuxa.epizy.com/animal_coloring_sheets_printable.pdfIn PDF document text
    • http://pavafisufopu.myartsonline.com/kaplan_s_cardiac_anesthesia_7th_edition_free_download.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/holt_mcdougal_algebra_1_common_core_textbook.pdfIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/73812969839.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/merge_data_from_multiple_excel_spreadsheets.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/58934149990.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/jizewu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 5472 bytes
SHA-256: eae339d6b7c5887e4e450b436b09058bf1eeca64f0f3d831895283193e5bc782
font_01_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10828 bytes
SHA-256: 618a60f4c6330faea409e07c710c4065ea19087cf0226d2ea93c9081fdd582cd